Alloy Grade UNS: HE – Higher Chrome and Nickel

  • Overview

    HE, also known as MTEK 29-10 or cast UNS J93403, is a high-performance alloy designed for extreme high-temperature applications. This heat-resistant alloy boasts a higher chromium and nickel content than many of its counterparts, contributing to increased strength, ductility, and corrosion resistance. With a service limit of 2000 degrees Fahrenheit (1095 degrees Celsius), HE maintains its structural integrity even under prolonged exposure to extreme heat. The addition of chromium, up to 30%, enhances its resistance to oxidation and other forms of high-temperature corrosion. This combination of properties makes HE a valuable choice for demanding applications in industries like aerospace, power generation, and chemical processing, where components must operate reliably under extreme thermal conditions.

  • Typical Uses

    Furnace fixtures, ore roasting equipment, oven exhaust, tube supports.

  • MetalTek Designation

    MTEK 29-10

  • Poured At:

    Carondelet Division, Sandusky International Division, Wisconsin Centrifugal Division, Wisconsin Investcast Division

Similar Specifications

Cast UNS: J93403

Wrought Grade: 312

Cast Grade: HE

Cast ASTM: A297, A608

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.20-0.50

Chromium: 26-30

Manganese: 2

Iron: n/a

Copper: n/a

Nickel: 8.0-11.0

Lead: n/a

Tin: n/a

Silicon: 2

Zinc: n/a

Minimum Mechanical Properties

Tensile, ksi

0

Tensile, MPa

0

Calculated PREn (Minimum)

0

Yield, ksi

0

Yield, MPa

0

Elongation

0%

Heat Treatment: Not Heat Treated

Frequently Asked Questions

Heat resistant stainless steel refers to alloys designed to maintain mechanical properties and resist oxidation at elevated temperatures.

Applications include furnace parts, heat exchangers, and components in petrochemical plants.

Heat resistant stainless steels can withstand temperatures up to 1,150°C (2,100°F), depending on the grade and exposure time.

High chromium and nickel contents stabilize the austenitic structure and form a protective oxide layer, resisting scale and oxidation.

Explore Other Alloys

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Non-Ferrous

Non-ferrous alloys are, literally, materials that are not iron-based. While others may provide non-ferrous materials of other materials, the MetalTek family of non-ferrous alloys are copper-based. In general, these materials deliver high strength, and excellent wear and corrosion resistance. They are often found in marine applications and also bushing, bearing, and gear environments.
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Stainless Steel

Stainless steels owe their ability to resist corrosion primarily to the presence of a passive film on their surface. Chromium is chiefly responsible for formation of the passive film. Iron ceases to rust at approximately 12% chromium content and resistance to oxidizing corrosives increases rapidly with chromium content up to approximately 20%.
Petrochemical Fittings

Specialty Alloys

Specialty Alloys comprise a broad group of materials that deliver properties for more demanding applications, use more exotic or expensive materials, or require special processes to manufacture. Where standard materials may not offer desired performance, specialty alloys (including those that are modified further) may be a sensible selection.